security-and-privacy/CanvasBlocker
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Code Releases Activity

Only use onHeadersReceived listener when necessary

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As mentioned in #214
This commit is contained in:
kkapsner 2018-08-28 21:09:03 +02:00
parent d020c55e11
commit bde8ac3e8e
2 changed files with 42 additions and 23 deletions
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61
lib/dataUrls.js
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@ -41,28 +41,47 @@
}
scope.init = function(){
browser.webRequest.onHeadersReceived.addListener(
function(details){
function listener(details){console.log("listener");
const headers = details.responseHeaders;
if (settings.blockDataURLs){
const cspMatch = (blockBlob? "": "blob: ") + "filesystem: *";
const headers = details.responseHeaders;
if (settings.blockDataURLs){
logging.verbose("Adding CSP header to", details);
setHeader(headers, {
name: "Content-Security-Policy",
value: `object-src ${cspMatch}; frame-src ${cspMatch}`
// + "; report-to https://canvasblocker.invalid/; report-uri https://canvasblocker.invalid/"
});
}
return {
responseHeaders: headers
};
},
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame", "object"]
},
["blocking", "responseHeaders"]
);
logging.verbose("Adding CSP header to", details);
setHeader(headers, {
name: "Content-Security-Policy",
value: `object-src ${cspMatch}; frame-src ${cspMatch}`
// + "; report-to https://canvasblocker.invalid/; report-uri https://canvasblocker.invalid/"
});
}
return {
responseHeaders: headers
};
}
function addListener(){
if (!browser.webRequest.onHeadersReceived.hasListener(listener)){
browser.webRequest.onHeadersReceived.addListener(
listener,
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame", "object"]
},
["blocking", "responseHeaders"]
);
}
}
function removeListener(){
browser.webRequest.onHeadersReceived.removeListener(listener);
}
function adjustListener(){
if (settings.blockDataURLs){
addListener();
}
else {
removeListener();
}
}
settings.onloaded(adjustListener);
settings.on("blockDataURLs", adjustListener);
};
}());